单选题 He regretted _____the days when he should have studied.

单选题 Parents who ignore their children and use their smartphones instead of ____ them attention may be putting their offspring at risk of depression.

单选题 Seeing is ______________.

单选题 Thanks to the nationwide promotion of electronic tickets, travelers can use their ID cards to enter and exit train stations instead of using paper tickets for .

单选题 My favourite hobby is ___________stamps.

单选题 _______a supermarket is quite difficult.

单选题 He insisted ______with us to the birthday party.

单选题 That book is really worth ____________.

单选题 It is no use _____a baby in that way. It is too young to understand.